1. High current, low magnetic loss, small parasitic capacitance, low heat generation, use of oxygen free copper wire to improve sound quality; The magnetic shielding mechanism has strong anti electromagnetic interference performance. 2. Thickened heat sink, silent and long-life fan; Solved the heat dissipation problem and better utilized the advantages of high power 3. Transparent sound, fast low-frequency response, strong mid frequency texture, high frequency smoothness, and minimal loss 4. Extremely low noise, quality, extremely low distortion, protecting your for original-sound experience 5. Protection mechanism: Input undervoltage, overheating, overcurrent, short circuit protection. No input anti reverse protection, positive and negative poles cannot be reversed! Product name:2.1 channel Bluetooth power amplifier board 160Wx2+220W Product model:-HT21 Colour:Black Material:PCB Package Contents: 1 * Amplifier board(With case) 1 * screwdriver Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.